3: Parallel Tracks | Columns are placed on a building for added support on the structure. The columns have to be parallel because it keeps what it is supporting balanced properly. | Parallel Columns | Railroad tracks are used for trains to transport goods and people. The tracks have to be parallel in order for the train to maneuver efficiently.

4: Contacts | Contact lenses must be congruent because if they are different sizes they would not fit in your eye correctly. | Currency | Currency has to be congruent shapes in order for it to be convenient to society.If they were not congruent it would be harder to carry currency efficiently.

5: Mercedes Benz | Volkswagen | The Volkswagen and Mercedes Benz logos are both symmetrical because when they are cut in half the are equal mirror images.

6: Pyramids | Prism | Cone | Cylinder

7: Greek Architecture has many ties to geometry through the many geometric shapes used in buildings. The steps are made out of rectangular prisms. The top of the roof has a obtuse triangle . Also the roof is supported by cylinders to keep the building supported. All of the shapes are created with angles and lines which is associated with geometry. | Obtuse Triangle | Cylinder | Rectangular Prism